How to configure CORS in docker environment variables

[pasquy73]

I'm using STH-Comet in a docker-compose yaml file and have CORS issues. Here is an extract of yaml file (I'm using .env file too):

  sth-comet:
    image: fiware/sth-comet:${STH_COMET_VERSION}
    hostname: sth-comet
    container_name: fiware-sth-comet
    restart: always
    depends_on:
      - database-mongo
    networks:
      - monitoring-net
    ports:
      - ${STH_COMET_PORT}:${STH_COMET_PORT}
    environment:
      - STH_HOST=0.0.0.0
      - STH_PORT=${STH_COMET_PORT}
      - DB_PREFIX=sth_
      - DB_URI=database-mongo:${MONGO_DB_PORT}
      - LOGOPS_LEVEL=INFO

I want to enable CORS using environment variables like STH_HOST or DB_PREFIX. I couldn't find the env var to set it from the documentation. Is it possible? At the moment, I'm fixing the problem by simply copying the config.js file (within enabled: 'true' in config.cors) into the container in this way:

docker cp config.js <CONTAINER_ID>:/opt/sth

[fgalan]

The env vars STH supports are described in https://github.com/telefonicaid/fiware-sth-comet/blob/master/doc/manuals/running.md. It seems there isn't any one related with CORS.

However, it shouldn't be difficult to add them, looking how others env vars have been implemented and do a similar thing. It would be great if you could provide a pull request with the improvement, pls ;)

Having said that, we don't use to enable CORS in backend services. But if you need it and want to implement it in STH, ok with us.

[pasquy73]

I changed the sthConfiguration.js file in the lib/configuration folder (I used ENV.CORS_ENABLED var and I added an if/else clause before of 226 line) as follow:

if (ENV.CORS_ENABLED && !isNull(ENV.CORS_ENABLED)) {
    module.exports.corsEnabled = JSON.parse(ENV.CORS_ENABLED);
    sthLogger.info(module.exports.LOGGING_CONTEXT.STARTUP, 'CORS value set to: ' + module.exports.corsEnabled);
} else if (config && config.cors && config.cors.enabled) {

I tried a test locally (on my Win PC); I also created (locally) a docker image (i.e. sth-comet:2.11.0) just copying the Dockerfile into the root directory, and I edited it to use my local changes. It worked using - CORS_ENABLED=true env var in my docker-compose file (see above). In the log file: msg=CORS value set to: true

Please let me know if it should be updated docs and tests

[fgalan]

I'd suggest to create a PR with the proposed fix, so we can provide feedback on it, please.

[pasquy73]

I created locally a task/cors_conf_docker branch but I cannot push it in the repo because I'm not authorized. Is it the right way to create a PR?

[fgalan]

I created locally a task/cors_conf_docker branch but I cannot push it in the repo because I'm not authorized. Is it the right way to create a PR?

You can do it using a fork (eg: PR https://github.com/telefonicaid/fiware-sth-comet/pull/605)

[fgalan]

PR #620